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Lab Five: Circular Motion
Purpose:
In this experiment, our goal is to verify that centripetal acceleration and force are radially inward
towards the center of the center of their circular trajectory.
Also, our goal in this experiment to verify that
centripetal acceleration is equal to v
2
/r and that centripetal force is equal to mv
2
/r.
Data and Calculations:
**For this lab, I was not able to be present because I was sick during the day of the lab
(bronchitis).
For this reason, the data used in my calculations was of the data that of Bryce Hediger,
Owen Dennis, and Lisa Logel collected on 5 February 2008.
Part One
Radius of Motion
47.3 ± .05cm
Curve Fit Parameter C for Centripetal Acceleration (a
c
)
2.122 ± .0145
Curve Fit Parameter C for Theoretical Acceleration
2.114 ± .317
Part Two
Mass of Pendulum
105.3 grams
Radius of Motion
47.3 ± .05 cm
Curve Fit Parameter for Centripetal Force
.2288
Curve Fir Parameter for Mass x Acceleration
.2260
Part One:

=
1r C
x
=
xC x 100 Percent Error
.

.
=.
→
.
.
= .
%
1 473 meters 2 112 0022
00222 122 x 100
102
Error
Part Two:
Same equations, but this time, mass replaces 1, making 1 = .1053 kg. The Curve Fit this case as
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 Winter '08
 ZINK
 Physics, Acceleration, Circular Motion, Force

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